Doubly Degenerate Cahn-Hilliard Models of Surface Diffusion

Motion by surface diffusion is a type of surface-area-diminishing flow such that the enclosed volume is preserved and is important is many physical applications, including solid state de-wetting. In this talk I will describe a relatively recent diffuse interface model for surface diffusion, wherein the sharp-interface surface description is replaced by a diffuse interface, or boundary layer, with respect to some order parameter.